Method of operating a liquid-level transmitter device and implementation thereof
a transmitter device and liquid level technology, applied in the direction of specific gravity measurement, program control, instruments, etc., can solve the problems of affecting the accuracy of liquid level transmitters
Active Publication Date: 2016-03-17
DRESSER LLC
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- Description
- Claims
- Application Information
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Benefits of technology
The patent introduces a solution for liquid-level transmitter devices to automatically compensate for changes in the liquid level without needing to interface with external sensors or enter data manually. This solution uses pre-defined data and reduces quality and error problems associated with conventional solutions.
Problems solved by technology
Unfortunately, accuracy of this value depends in large part on the operative characteristics of the structure.
Because the structure is largely mechanical, small changes in physical properties, dimensions, and tolerances can frustrate the proportionality that the structure relies upon to generate accurate information about the level of liquid.
Nevertheless, these problems can permeate throughout the structure and, ultimately, induce errors in the value of the measurement.
However, none of these solutions address accuracy issues across a broad swath of applications.
Implementations that position the level transmitter device in hazardous areas, for example, can introduce conditions that distort measurements from external sensors and / or foreclose individuals from access to the level transmitter device.
Moreover, data entry by individuals may exacerbate problems, particularly if the individual introduces inaccurate information that is meant to correct the error in the value of the measurement.
Method used
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[0015]The discussion below describes implementations of a liquid-level transmitter device (“transmitter device”) for use to monitor levels of a liquid in vessels (e.g., pipes, tanks, reservoirs, etc.) in an industrial process line. At a high level, the transmitter device has a buoyant member that moves in response to changes in the level of the liquid in the vessel. The transmitter device can translate the movement into a measured value that reflects the level of the liquid. As noted more below, liquid-level transmitter devices made in accordance with this disclosure offer built-in compensation to improve the accuracy of the measured value. This feature addresses changes in operative characteristics of one or more components on the liquid-level transmitter device. Of particular interest, it has been found that on some conventional devices, even a small drift in Young's Modulus (˜0.0285% / ° C.) can lead to errors in the measured value that reflects the level of the liquid. These findi...
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A method that configures a liquid-level transmitter device to generate a measured value for a level of a liquid. The method includes steps to correct for changes in physical properties of one or more components of the device. In one embodiment, the method utilizes a correction value that incorporates data from a temperature sensor disposed inside of the device, for example, inside of the electronics member.
Description
BACKGROUND[0001]The subject matter disclosed herein relates to improvements in flow monitoring technology for use in industrial processes, with particular discussion about embodiments of a liquid-level transmitter device that integrates with control systems for the industrial processes, the embodiments being configured to compensate for changes in operative characteristics of the device to generate measured values for liquid levels in a reservoir.[0002]Level transmitters and like devices are useful to monitor liquid levels in a process line. These devices have particular utility to industrial processes typical of chemical, petro-chemical, oil & gas extraction and transportation, and the like. In one form, the devices can have a structure to convert buoyant action of one or more components into a measured value that reflects the level of liquid in a vessel or a reservoir. The structure can also communicate this measurement to a process control system that regulates operation of devic...
Claims
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Login to View More IPC IPC(8): G01F23/24
CPCG01F23/246G01F23/34G01F1/84G01F1/8409G01N11/16G05B19/042G01F23/22G01N9/002G01F1/8486G01F1/50G01L27/005G01F23/00G01F23/24
Inventor LELEDY, STEPHANE MARCELVITAL, DENIS AUGUSTE
Owner DRESSER LLC